Wearable biometric monitoring devices and methods for determining if wearable biometric monitoring devices are being worn

A biometric monitoring device configured to be worn by a subject, the device comprising:

• a physiological sensor configured to detect and/or measure physiological information from the subject;
• and
• at least one processor configured to:
• create a first signature by assessing sensor readings from the physiological sensor at a first prior time, in response to the subject indicating at the first prior time that the device is being worn;
• create a second signature by assessing sensor readings from the physiological sensor at a second prior time, in response to the subject indicating at the second prior time that the device is not being worn;
• analyze signals from the physiological sensor to detect a signature unique to the subject wearing the biometric monitoring device;
• and
• determine if the detected signature is the first signature associated with the biometric monitoring device being worn or the second signature associated with the biometric monitoring device not being worn.